abstract
| - Spec's cimolestans are an ancient group of mammals that reaches back well into the Late Cretaceous. DNA analyses have recently confirmed the suspicions that they are very basal eutherians and Cimolesta forms a sister taxon to Placentalia, to which all surviving eutherians of Home Earth (and thus most of its mammals) belong, as well as most Spec eutherians from the Florida pseudorat to the sut. Fossils show that the cimolestans diversified quickly during our Tertiary, producing a myriad of strange new groups, but then mysteriously went extinct. In Spec, the cimolestans shared the first part of their Home-Earth counterparts’ history, emerging at the end of the Cretaceous as small, nimble shrew-like forms which fed on insects and small vertebrates. In Spec, however, as the dinosaurs continued their domination of the large vertebrate niches, the cimolestans failed to diversify, and the their bodyform remains similar to their Mesozoic archetype. Extant cimolestans vary from minute, 2g insectivores to frugivores that weigh just shy of 1kg. Many of the larger forms have gliding membranes, and remind the zoologist of the clougo or flying lemur of our South East Asia. Some forms, indeed, behave much like dermopterans, being omnivores or frugivores, and bear the same name despite their differing ancestry. There exist carnivorous cimolestans as well, however, aptly named batweasels. Cimolesta is entirely restricted to tropical Asia and Africa, and most forms are arboreal.
|